Best location in Bangkok is right next to the British Embassy down a leafy soi. At the bottom of the soi are two department stores, at the bottom of one is a tops supermarket which is simply fantastic. Close by are two BST stations and Sukhumvit is around the corner if that's your thing. Silom is also not far, about a 20/25 minute walk. Nuna was always contactable and quick to respond and was helpful in giving advice and recommendations. The apartment building itself is nice with a great pool on the ground floor and a gym. We enjoyed our stay and wouldn't think twice about returning. So we give a big thumbs up to Nuna!
Our recommendation on our stay is a new restaurant opened a week ago named Baan:
http://www.baanbkk.com/